Fill in each blank with the correct letter A,B,C and D.

.................... is a plant that grows in swamps.
1. coconut
2. fir
3. cactus
4. mangrove
The large flat teeth at the back of the jaw are used to ................ food.
1. bite
2. crush
3. cut
4. tear
................. is not a source of energy.
1. Coal
2. Wood
3. Soil
4. Gas
Rocks become soil through the process of .............
1. weathering
2. burning
3. crushing
4. heating
Our body needs food and ............ to produce energy.
1. oxygen
2. nitrogen
3. chlorine
4. carbon dioxide
Mosquitoes, cockroaches and lice are ............... animals.
1. harmless
2. important
3. useful
4. harmful
Rubber absorbs ............ very well.
1. water
2. heat
3. shocks
4. air
Plants take ......... from the air through their leaves.
1. water vapour
2. nitrogen
3. oxygen
4. carbon dioxide
We must never introduce objects made of .......... into electrical sockets.
1. plastic
2. metal
3. glass
4. cotton